Office chair



FIG. 1 is a perspective view of an office chair showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawing depict environmental subject matter onlyand form no part of the claimed design.

CLAIM The ornamental design for an office chair, as shown and described.